Alright, well the A/C in my truck was non-functional when I purchased it. Anyways, I read about the slow leaks that are typical in these trucks and bought 2 cans of Freon. I put one in the low pressure valve, let the A/C run for 15 minutes, didn't change anything. So an hour later, I put the other can in, and let the A/C run, but when the A/C was on, I noticed a noise and found out what was making it. Please watch the video and let me know if this is normal, what it is, and if it isn't normal what do I do??? Thanks.

http://s252.photobucket.com/albums/h...t=100_1818.mp4

 

That's your compressor kicking on. Before, with no refrigerant in it, the low pressure switch wouldn't allow the clutch on the pulley to engage, which spins the compressor.
Now that you have some charge in it, and therefore some pressure, the clutch on the pulley is now engaging.

A rapid cycling on and off is normally a sign of low pressure. If you are trying to charge it and the ambient air temperature is below about 80 degrees, you will not get the can fully empty.
Get a bowl and fill it with hot tap water to set the can of refrigerant in while you are charging it.

I usually recommend taking it to a professional, with the price of refrigerant these days, and the risk of messing something up worse, it usually pays for itself in the end. Dumping $40 of refer into it and having it leak right back out sucks. There is a reason it was empty in the first place.

 

So basically, it just needs more refridgerant, but it needs to be at the right temp first??? Aren't these trucks notorious for slowly leaking? The stuff I got supposedly has "Leak sealer"

 

I found my slow leak and have to replace compressor itself leaking. If you buy the freon with dye you will find the issue